.toTop {
  position: fixed;
  right: 70px;
  bottom: 70px;
  height: 42px;
  text-align: center;
  width: 42px;
  cursor: pointer;
  background: #9F9F9F url("../images/back-top.png") no-repeat center center;
}
.toTop span {
  display: block;
  width: 26px;
  height: 26px;
  padding: 8px;
  line-height: 13px;
  font-size: 12px;
  color: #FFF;
  background-color: #767676;
  opacity: 0;
  transition: opacity .2s;
}
.toTop:hover {
  background-image: none;
}
.toTop:hover span {
  opacity: 1;
}
